arc: move SYS_MONITOR_BASE setup in Konfig

Following SPARK ARC now has SYS_MONITOR_BASE setup via Kconfig.
This makes "include/configs/*.h" cleaner and more flexible.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
diff --git a/Kconfig b/Kconfig
index fed488f..9af31e3 100644
--- a/Kconfig
+++ b/Kconfig
@@ -139,7 +139,7 @@
 	  new boards should not use this option.
 
 config SYS_TEXT_BASE
-	depends on SPARC
+	depends on SPARC || ARC
 	hex "Text Base"
 	help
 	  TODO: Move CONFIG_SYS_TEXT_BASE for all the architecture